ChrisX, 2,400 milligrams (the upper limit of current recommenendations by the Federal Governments's National High Blood Pressure Education Program (NHBPEP). The National Institutes of Health, National Heart, Lung, and Blood Institute recommends 1,500 milligrams. Normal BP has been redefinened as less than 120/80, so many people now fall into the questionable area for hypertension. Check out http://www.nhlbi.nih.gov